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2 Ars Separatoria Acta

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Ortho-para-hydrogen and para-ortho-deuterium separation factors on LiX zeolite at 50-112 K

Bystrov V. P., Ivanov E. B., Parbuzin V. S.

Ars Separatoria Acta

2006

No. 4

37-42

The paper reports on a comprehensive set of experimentally measured orthopara- H2 and para-ortho-D2 separation factors at low temperature adsorption on an especially prepared sample of X type zeolite. The zeolite was investigated in its lithium cationic form by a new version of the gas solid chromatographic technique ECMA (Elution Chromatography with Modifying Adsorbates). Six types of eluents were used: four pure gases He, Ne, H2, D2, and two mixed eluents – He-H2 and He- D2 various compositions. The new ECMA version gives results of high precision. At easily attainable temperatures 77-50 K and practically suitable fractional coverages 0.6-0.8, the selectivity of adsorbent LiX ranges from 1.45 to 2.0 for ortho-para-H2, and 1.108 - 1.254 for para-ortho-D2. A low ortho-para-conversion catalytic activity and high selectivity of new sorbent LiX allow separation of orthopara- isomers of dihydrogens by Moving Temperature Gradient Adsorption technique.

Cryoadsorption as universal route to dihydrogens of high and ultrahigh individual purity

Parbuzin V. S., Yakovlev V. A., Lukyanov A. A., Leshchev Y. A.

Ars Separatoria Acta

2003

No. 2

84-96

The paper describes a new efficient cryoadsorptive method of dihydrogens p-H2, o-H2, HD, o-D2, p-D2, HT, DT, T2 separation with moving temperature gradient on the adsorbent fixed bed. The method was developed at the Department of Chemistry, Moscow State University, as a result of many years’ experimental and theoretical investigations. The separation method, and corresponding periodical action apparatus named MTGA (Moving Temperature Gradient Adsorption), and MGU DETRA (Multispecious Gas Separator-Upgrader: DEuterium, TRitium, Adsorption), respectively, are applied to prepare individual dihydrogens in very pure isotopic or nuclear-spin forms. In this paper, the basic design and possibilities of a typical three – stage laboratory adsorption separative cascade are given. The cascade was used to prepare two gases of ultrahigh isotopic purity (99.9998 mol.% deuterium and 99.98 mol.% deuterium hydride HD) for the first time. Moreover, the paper presents the results of successful studies on enriching microquantities of tritium-containing molecules HT, DT, T2 from macrocomponents H2 and D2.